<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <h1>注册页面</h1>
    <input type="text" placeholder="请输入用户名" @blur="f()" v-model="user.username">{{info}}<br>
    <input type="password" placeholder="请输入密码" v-model="user.password"><br>
    <input type="text" placeholder="请输入昵称" v-model="user.nickname"><br>
    <input type="button" value="注册" @click="reg()">
</div>
</body>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
    let v = new Vue({
        el: "body>div",
        data: {
            user: {
                username: "",
                password: "",
                nickname: ""
            },
            info:""
        },
        methods: {
            reg(){

            },
            f(){
                axios.get("/check?username="+v.user.username).then(function (response) {
                    v.info = response.data;
                })
                console.log("用户名:"+v.user.username);
            }
        }
    })
</script>
</html>